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Yubikey OTP and HOTP/OATH Validation Server

Simple and lightweight Yubikey OTP and HOTP/OATH validation server
to be used with Yubico's Yubikey USB tokens including a powerful
administration tool, yubiserver-admin, with which you can manage
yubiserver's database by adding,deleting,activating and deactivating
users that validate with OTP or HOTP/OATH tokens.

Yubiserver implements Yubico's server side API and can be used
with Yubikey USB tokens and any other client that can implement
the same API.